I hadn't realised that there was one specific quota exception class in the repository project: ContentQuotaException.
There were no exceptions for person/user-related quotas. So I have moved my new QuotaViolationException from Thor into the core repo and have refactored the existing ContentQuotaException so that it extends QuotaViolationException, retaining AlfrescoRuntimeException as a base type for backwards compatibility.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@58135 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261